I’d been having problems with a Etekcity 5R2 wifi dongle, probably due to iffy support for the RTL8188CUS chip inside:
The most recent place I tried to use it was in the older Raspberry Pi B+ I have.
As before, the connection was intermittent. I could keep it stable by backing my router down to 802.11b but that hamstrung other devices.
Then I ran across this tip:
/etc/modprobe.d/8192cu.conf: options 8192cu rtw_power_mgnt=0 rtw_enusbss=0
and this tip:
/etc/modprobe.d/raspi-blacklist.conf: blacklist rtl8192cu
As I said the connection was terrible so I used mosh to simulate a functional ssh login and make these changes. 🙂
Rebooted the pi and the wireless is stable.
Who cares about problems with a discontinued wifi dongle?
You do, because the pi-beloved Edimax 7811-un uses that same chip. Hopefully this will help some other frustrated linuxy user.